Mozilla did an emergency update for Firefox 3.6 & 5.0 on July 11th. There was an automatic update for Mac user only. While Mozilla did also publish Firefox 3.6.19 and 5.0.1 to the FTP site as well as at getfirefox.com for Windows and Mac users, there is no difference between Firefox 3.6.18/3.6.19 or 5.0/5.0.1 for Linux and Windows users. Therefore, an automatic update was not pushed out for Windows and Linux users. If for whatever reason you would like to update to Firefox 3.6.19 or 5.0.1 and are using Windows or Linux, you will need to so manually via getfirefox.com or the Mozilla FTP site.